PREUSSAG-Kiesmantel-method - details

The „PREUSSAG-Kiesmantel-method“ is a further development of the RANNEY/FEHLMANN-method", which is performed by a pushing method, without rotation.

The hydraulic preasure of the ground water is creating a flowstream witch is carrying parts of soil into the openings of the "drilling"-pilot. This leads to a kind of "open space" arround the pilot into whitch the drilling pipe is pushed. Using this method step by step the final length of the lateral will be reached.

During pushing works, soil samples are taken and sieved. The diagramms of sieve analyses are neccesary to determine the grain size of the filter pack and the slot size of the screens. Finally an artificially flushed in gravel pack will be installed.

Collector Wells (RCW) constructed by this method show maximized well efficiencies.

With the "PREUSSAG-Kiesmantel-method" it is possible to install a bridge slotted screen with a slot size of 0,6 mm and filter gravel of 0,8 - 1,2 mm. With such an installation even fine sand aquifers can be withdrawn, where 60 % of the soil sample have a grain size less than 0,15 – 0,2 mm.

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